[cfe-commits] r122533 - in /cfe/trunk: lib/Sema/SemaTemplate.cpp test/CXX/temp/temp.param/p9-0x.cpp

[Douglas Gregor]

Author: dgregor
Date: Thu Dec 23 18:20:52 2010
New Revision: 122533

URL: http://llvm.org/viewvc/llvm-project?rev=122533&view=rev
Log:
Non-type template parameter packs cannot have default arguments.

Added:
    cfe/trunk/test/CXX/temp/temp.param/p9-0x.cpp
Modified:
    cfe/trunk/lib/Sema/SemaTemplate.cpp

Modified: cfe/trunk/lib/Sema/SemaTemplate.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaTemplate.cpp?rev=122533&r1=122532&r2=122533&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaTemplate.cpp (original)
+++ cfe/trunk/lib/Sema/SemaTemplate.cpp Thu Dec 23 18:20:52 2010
@@ -649,6 +649,14 @@
   
   // Check the well-formedness of the default template argument, if provided.
   if (Default) {
+    // C++0x [temp.param]p9:
+    //   A default template-argument may be specified for any kind of
+    //   template-parameter that is not a template parameter pack.
+    if (IsParameterPack) {
+      Diag(EqualLoc, diag::err_template_param_pack_default_arg);
+      return Param;
+    }
+
     // Check for unexpanded parameter packs.
     if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument))
       return Param;

Added: cfe/trunk/test/CXX/temp/temp.param/p9-0x.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/temp/temp.param/p9-0x.cpp?rev=122533&view=auto
==============================================================================
--- cfe/trunk/test/CXX/temp/temp.param/p9-0x.cpp (added)
+++ cfe/trunk/test/CXX/temp/temp.param/p9-0x.cpp Thu Dec 23 18:20:52 2010
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -std=c++0x -fsyntax-only -verify %s
+
+// A default template-argument may be specified for any kind of
+// template-parameter that is not a template parameter pack.
+template<typename ...Types = int> // expected-error{{template parameter pack cannot have a default argument}}
+struct X0;
+
+template<int ...Values = 0> // expected-error{{template parameter pack cannot have a default argument}}
+struct X1;
+